How can u build pdf book on java

Answer 1

https://www.vogella.com/tutorials/JavaPDF/article.html

Answer 2

Hope this helps you

Answer 3

Please put Java in tags (relevant programming language name) ☝

Answer 4

This could be also helpful:
https://www.baeldung.com/java-pdf-creation
https://medium.com/@KonfHub/programming-by-example-generating-pdfs-in-java-f02e961b42b1

Btw: I edited your tags. Please use relevant tags next time. It helps to make question searchable.